Fixed the tool change unretract logic when using `TOOLCHANGE_FILAMENT_SWAP` but not  `TOOLCHANGE_FS_PRIME_FIRST_USED`

Previously:
if not using `TOOLCHANGE_FS_PRIME_FIRST_USED` (disabled by default), then the unretract would simply never occur, defeating the entire purpose of enabling the filament swap feature.

Now:
After the 'Prime' and the 'Extra Prime' movements occur, log that the selected extruder has been primed. If you switch extruders again, then this will allow that extruder to retract. If it hasn't been primed yet, then it will not retract.

HEAVY WIP

…_Retraction' into pr/21142

…omb/Marlin into pr/21142

Ignore this commit - temporarily removed Extruder_cutting_recover to easier comparision within Github Desktop

Restore extruder_cutting_recover() method that was temporarily removed last commit.
Convert TooCold checks to use a method instead to verify extruder being moved is able to be moved.

Normalized extruder priming by creating a method for it to be used as needed. Should save minor amount of space if `TOOLCHANGE_FS_PRIME_FIRST_USED` is used.

- Replaced corresponding lines in main `tool_change` and `tool_change_prime` with the call

Relocated static variable declarations to above the extruder priming method since that new method requires reading them

Single Nozzle setups should always retract prior to loading in the first filament. As such, they don't need reduced speeds on first nozzle prime.

Deleted temporary file that has been merged in with tool_change.cpp

Modify Declaration here to allow viewing the relevant command description in tool_change.cpp

Didn't realize that was also used by M217 'Q'

Converted the Tool_Change_Prime() tooCold check to use the standardized 'TooCold()' method

Removed the check that 'extra_prime > 0' qualification because it would prevent the routine from being run, when the routine is already locked behind both a define and `M217 V1`

Removed comments that were notes to self for testing.

TOOLCHANGE_FS_INIT_BEFORE_SWAP did not clearly communicate what the setting was doing.
As such, it has been renamed to `TOOLCHANGE_FS_SLOW_FIRST_PRIME`.

Also clarified functionality of  `TOOLCHANGE_FS_PRIME_FIRST_USED`

Fixed priming a nozzle twice when `TOOLCHANGE_FS_PRIME_FIRST_USED` and that T# was issued twice in a row - This functionality is only meant for T0!